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METHOD FOR ANALYZING STRUCTURE AND PURITY OF SEROTONIN TRANSPORTER IMAGING AGENT [123I] ADAM AND PRECURSOR SnADAM

a serotonin transporter and imaging agent technology, applied in the field of serotonin transporter imaging agent (sert) tracer structure analysis, can solve the problems of inability to determine the concentration of non-radioactive compounds, inability to direct injection into the human body, and inability to detect the presence of radioactive compounds, etc., to achieve the effect of reducing image interference, background, content, and reliability

Inactive Publication Date: 2010-05-06
INST NUCLEAR ENERGY RES ROCAEC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0023]To sum up, the present invention is an analytical technique for identifying or determining the chemical structures of SERT SPECT imaging agent [123I]ADAM and its labeled precursor SnADAM and the chemical purity of SnADAM by using an MS / MS method and an HPLC method. The objective of developing this technique is to check the drug integrity, so as to guarantee the reliability, stability, and high quality of the active component in the SPECT imaging agent for intravenous injection and meanwhile reduce the image interference, background, and the content of impurities (if any) that might compete for transporters.

Problems solved by technology

However, most of the tracers have the disadvantages of undesired specific binding, pharmacokinetics, selectivity, specificity, or signal transduction property.
However, since the eluent used in HPLC contains a large amount of acetonitrile, it is not suitable for direct injection into the human body.
However, the radioactive RCP analysis can only determine the activities of chemical species containing the radionuclide I-123, including radioactive compounds containing ionic I-123 and I-123 bond, but cannot determine the concentrations of non-radioactive compounds, such as SnADAM and other degradation products and impurities.

Method used

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  • METHOD FOR ANALYZING STRUCTURE AND PURITY OF SEROTONIN TRANSPORTER IMAGING AGENT [123I] ADAM AND PRECURSOR SnADAM
  • METHOD FOR ANALYZING STRUCTURE AND PURITY OF SEROTONIN TRANSPORTER IMAGING AGENT [123I] ADAM AND PRECURSOR SnADAM

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Experimental program
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first embodiment

Analysis of the Purity of SnADAM Using HPLC and Validation Experiment for the Analytical Method

[0048]For this method, when discussing the optimum analytical conditions for HPLC and HPLC-MS / MS, [123I]ADAM is replaced by non-radioactive [127I]ADAM first. Although [127I]ADAM and [123I]ADAM have different molecular weights, there is no significant difference between their chemical properties (for example, HPLC retention time). Therefore, the optimum HPLC chromatographic conditions for non-radioactive [127I]ADAM are applicable to analysis of [123I]ADAM.

[0049]Molecular ion masses of components of HPLC chromatographic peaks are determined by using mass spectrometer Q1 scan, and then the structures of the component fragments are determined by using the technology of tandem mass spectrometer precursor ion scan and product ion scan, so as to prove that the components are SnADAM and non-radioactive [127I]ADAM (which will be described in detail in Second Embodiment). Since the eluent used for H...

second embodiment

Validation of Method for Identifying Structures of SnADAM and [127I]ADAM

[0081]Chromatographic Conditions for MRM ANALYSIS:

[0082](1) Chromatographic conditions for SnADAM[0083]a. Column: Chromolith Performance RP-18e, 4.6×100 mm (Merck)[0084]b. Eluent: methanol / acetonitrile / ammonium acetate solution (10 mM, pH 7.0)=58.8:39.2:2 (v / v / v)[0085]c. Flow rate: 1.0 mL / min

[0086](2) Chromatographic conditions for [127I]ADAM[0087]a. Column: Zorbox Eclipse XDB-C18, 4.6×50 mm, 1.8 μm (Agilent, USA)[0088]b. Eluent: methanol / acetonitrile / ammonium acetate solution (10 mM, pH 7.0)=80:20:0.4 (v / v / v)[0089]c. Flow rate: 0.4 mL / min

[0090]In this embodiment, the optimum MRM conditions for HPLC and HPLC-MS / MS were studied by replacing the [123I]ADAM samples needed for developing the relative analytical methods by non-radioactive ADAM (i.e., [127I]ADAM). Although [127I]ADAM and [123I]ADAM have a molecular weight difference of 4 Da, the chemical properties, such as HPLC retention time, fragmentation pathway (...

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Abstract

An analytical technique for determining the structures of serotonin transporter (SERT) imaging agent [123I] ADAM and its precursor, SnADAM by using a high-performance liquid chromatography tandem mass spectrometer (LC-MS / MS) is provided. An analytical technique for determining the purity of SnADAM by using a high-performance liquid chromatograph (HPLC) is also provided.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a method for analyzing the structure of a serotonin transporter (SERT) tracer, and more particular, to a method for analyzing fragmented structures of [123I]ADAM and precursor thereof, SnADAM, and an analytical method for determining the purity of SnADAM.[0003]2. Related Art[0004]Serotonergic neuronal function plays an important role in the central nerve system. Serotonin is mainly produced in the region of the raphe nuclei, and then projected to other brain regions, such as olfactory bulb, cerebral cortex, hippocampus, and basal ganglia. Serotonin transporters (SERTs) are macromolecular complexes and located in the semipermeable membrane of serotonergic neuronal terminals for regulating the neuronal function and content of serotonin, removing serotonin from the synaptic cleft and sending back into the neuronal cytoplasm, where it can be repackaged for reuse or metabolized.[0005]Recent s...

Claims

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Application Information

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IPC IPC(8): G01N33/20G01N33/50
CPCG01N30/7233G01N30/8606G01N30/8682G01N2030/042G01N2030/342G01N2030/8813H01J49/0031Y10T436/174614Y10T436/24Y10T436/13
Inventor LIU, KUNG-TIENYANG, HAN-HSINGHSIA, YI-CHIHSU, CHANG-YUNGLIN, TAI-SHENGCHEN, CHIA-CHIEHSHEN, LIE-HANG
Owner INST NUCLEAR ENERGY RES ROCAEC
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